Thank you for your reply. I did first attempt the CType with the code shown below but you still get a 'Unable to cast object of type' exception. I've just used a ultraListView1, added an ultraCombox, linked this to the mainColumn.EditorComponent and added 1 Item. You click on the dropdown combo arrow, you get the exception, if you trap the exception and continue the combobox shows.

Look forward to how to correct this.

Regards
Paul
 

Dim embeddableElement As EmbeddableUIElementBase = CType(e.Item.UIElement.GetDescendant(GetType(EmbeddableUIElementBase), e.Item), EmbeddableUIElementBase)

Dim editor As EmbeddableEditorBase = CType(IIf(Not embeddableElement Is Nothing, embeddableElement.Editor, Nothing), EmbeddableEditorBase)

 If (Not editor Is Nothing AndAlso editor.SupportsDropDown) Then
    editor.DropDown()
  End If

Hi Paul,

Another thing you can try is to remove the second parameter from the call to GetDescendent. Try this:

    Private Sub UltraListView1_ItemEnteredEditMode(sender As Object, e As Infragistics.Win.UltraWinListView.ItemEnteredEditModeEventArgs) Handles UltraListView1.ItemEnteredEditMode
        '	If the embeddable editor for this item supports a dropdown,
        '	call the DropDown method.
        Dim embeddableElement As EmbeddableUIElementBase = e.Item.UIElement.GetDescendant(GetType(EmbeddableUIElementBase))
        Dim editor As EmbeddableEditorBase = IIf(Not embeddableElement Is Nothing, embeddableElement.Editor, Nothing)

        If (Not editor Is Nothing AndAlso editor.SupportsDropDown) Then
            editor.DropDown()
        End If
    End Sub

If this works for you, I will dig into why it was written that way and possibly change it in the docs.

Thank you for reply. That works perfectly.

I hope this helps other as it's been a learning curve for me.

Thank you for your time.

Regards
Paul

Hi Paul,

Try this code. I added explicit casts for the editor types

Public Class Form1
    Private Sub UltraListView1_ItemEnteredEditMode(sender As Object, e As Infragistics.Win.UltraWinListView.ItemEnteredEditModeEventArgs) Handles UltraListView1.ItemEnteredEditMode
        '	If the embeddable editor for this item supports a dropdown,
        '	call the DropDown method.
        Dim embeddableElement As EmbeddableUIElementBase = CType(e.Item.UIElement.GetDescendant(GetType(EmbeddableUIElementBase)), EmbeddableUIElementBase)
        Dim editor As EmbeddableEditorBase = CType(IIf(Not embeddableElement Is Nothing, embeddableElement.Editor, Nothing), EmbeddableEditorBase)

        If (Not editor Is Nothing AndAlso editor.SupportsDropDown) Then
            editor.DropDown()
        End If
    End Sub
End Class

Thank you for reply but that makes no difference you still get the same errors

Option Strict On Disallows implict conversions from UIElement to EmdeddableUIElementBase
Option Strict On Disallows implict conversions from Object to EmdeddableEditorBase

If you change Dim embeddableElement As EmbeddableUIElementBase then the second line gives you an error of editor is not a member.

Look for to the next solution

Kind Regards
Paul